Rotary valve



July 12, 1927' G. F, RATHBUN ROTARY VALVE Filed Dec. 29, 1924 nvenoz:

@ce eg 27a/)gale attorney;

Patented July 12, 1927. i l f l UNITED 'STATESPATENT f GEORGE r. nA'rHnUmor PONTIAC, MICHIGAN.

isto'grAnv vALvE. y Application filed.k December 29,1924. `Seria1 I\1'o.v758,642.

This invention relates to rotary valves for sages therebetween', and longitudinally slotinternal combustion engines, for which purted toy provide communication between said poserotary valves have been often hereto passages and said portsV when the said suggested but `have usuallyl been of suchA sleeves are rotated vby they tube to required-60 Vnature that their production was expensive positions. The sleeves vand Vsaid tube are or theirconstruction unduly complicated. also provided with coinciding ports there- This invention vhastor its object'to'prothrough to permit'passage of exhaust gases vide a form of yrotary valve which may be into` and through' the said tube. The said cheaply constructed and which is yot simple sleeves are removable and interchangeable, G5

form, enabling it to be readily` adaptedto an permitting the building up of a valve to engine without great eXpense,'the said valve suit various numbers and dispositions ot cyly by its substitution for puppet valves such indcrs, and may be secured with their ports as are'usually used vin internal combustion in any desired'relative arrangement circumengines, 'enabling a large number otmovterentiallyi of the tube according to re- 7U ing parts to be dispensed with, and eliminatquired timing of `the valves.

ing the necessity of eecting fine and fre- All yof which is more particularly dequentl adjustment of parts which is one of described and ascertained hereinafter, by the disadvantages of the puppet valve conway of'example, having reference to the acstruction. companying drawing, whereinv 75 The said invention alsohas as an important Figure 1 is aA horizontal 'section through object, the provision of simple interchangethe cylinders and valve casing oan engine, able elements Ywhich when assembled to-k illustrating in plan and partlyv in section' a gether in' various relative arrangements acrotary valve embodying. the said invention; coi-ding to requirements result in the pro- 1 Figure 2 is a vertical section through the S0 duction ot a rotary valve which .may be valve casing, illustrating in perspective the adapted to the needs of various ytypes of ensaid valve; n l gines and diierent numbers and arrange- Figure 3 is a transverse section taken on mentot cylinders. the line 3X-3", Figurel;

The said'invention still further aims to `Figure 4f is 'a detail perspective view ofs provide in a rotary valve fory the eiiectual one of the sleeves removed; f K- utilization of exhaust passages therein Vfor `Figure 5 is asimilar view to Figure 4, the preheating of inlet gases, and the said illustrating another of the said 'sleevesyand invention s still further has as its yobject to Figure 6- illustrates a modified application provide a built up rotary valve wherein pasof the valve. y Y v y sages are'tormed by the relative disposition Similar characters ot reference indicate of'v parts `ofthe valve and the necessity of similar 'parts in the several yfigures of the machining such'passages is avoided. drawing.y l Y Stilly further objects subsidiary to or,re-` 1, 2, 3 and l indicate the cylinders oan sulting from the aforesaid objects, or from engine surmounted'by a cylinder head cast- .95.

theconstruction or operation offthefinvening' 5 which also'has formed integral there# tion as it may becarriedinto eliect, will with artubnlar valvefcasing @communicabecome apparent as the said invention is tion between the'ibore ot ysaid valve casing hereinafter further disclosed. and tliesaid` cylindersbeing-eected by parts Incarrying the said invention'into etlect,v 7, 8, 9.and 10. Y f v I ma provide a tubular casing having a .vlThe lower, part of thevalve casing 6 is plurality ot ports, each of which co'nimuniprovided withan elongated passage ll'rwith cates lwith an engine cylinder `for inlet and whiclran 1inlet pipe 12 communicates, yand exhaustpurposes, a rotarysvvalve in said Vcas- 13 is a tubularliner inserted in the said valve ing, said rotary valve comprising a central casing and provided with inlet ports 14 and 105 tube of substantially smaller outside diam- V15. Passing through the .said casing and eterfthan the bore of said ,ca-sing, and sleeves o' substantially smaller diameter than said 'or casting-sequel in number to said ports,- liner isa tube 16,'one end of which receives said sleeves beingv mounted'upon and occu- `andis closed by the'boss'l' of a gear 18 pying the space between said tube and said adapted to be driven in any suitable manner U0 casing, kthe said sleeves being relatively to effect the 'rotation of the said tube 16.

spaced along said tube kto'form' .inlet pas- Ordinarily lingrotary valve `construction sleeves being spaced endwise on saidrpipe whereby inlet passages are provided therebetween, said` sleeves having inlet ports communicating withv said passages, and said sleeves and said pipe having coinciding exhaust ports therein.

2. A rotary valve for internal combustiony engines, formed by sliding cast sleeves provided with inlet and exhaust ports therein on to a tube, adjusting said sleeves longitudinally to suit any desired cylinder arrangement andin a rotary manner to suit any relative port arrangement, perforating the tube to coincide with required positions oli the exhaust ports of said sleeves at any time after said positions have been .deterinined, and securing said sleeves in positions of adjustment on ksaid sleeve.

3. A rotaryvalve comprising an exhaust pipe, a plurality of separate sleeve valves fitted over said pipe, means for adjusting Said valves longitudinally and circumfer-` entially with respect to said pipe, said valves being adapted to convey fuel mixture to adjacent cylinder ports, said pipe and valves having coinciding recesses whereby to con vey 4exhaust gas from adjacent cylinder ports to said exhaust pipe.

4. A rotary valve comprising-a valve easing adapted to communicate with a pluralityof cylinder ports, a rotary exhaust pipe within "said casing, and a plurality of valves in the form of sleeves adjustably fitted on Isaidpipe and disposed adjacent said ports, said sleeves being spaced endwise on said pipe whereby inlet passages are provided therebetween, said sleeves having inlet ports communicating with said passages, and said sleevesfand said pipe having coinciding exhaust ports therein.

In testimony whereof affix my signature.

` GEORGE F. RATHBUN. 

